H2O: Just Add Water

H2O: Just Add Water, also known as H2O, is an Australian dramatic fantasy television programme for children and teenagers created by Jonathan M. Shiff. It first screened on Australia's Network Ten and runs in syndication on channels in over 120 countries and has a worldwide audience of more than 250 million. It was filmed on location at Sea World and other locations on the Gold Coast. The show revolves around three teenage girls facing everyday teen problems with an added twist: they're mermaids with powers over water.

Backstages of the Series
There are three different types of mermaid tails used on the show: custom-fitted tails that the girls swim in, a "floppy tail" used for stationary shots, and a "hard tail" for stunts. The custom costumes took six months to build, with the tails and tops made from body casts and comprising individually hand-crafted scales. The finished product weighs between 12 and 15 kilograms (26 and 33 lb). Inside the tail are leg straps where the girls are strapped up and then zipped up. Once in costume, the girls have to be lifted into the water. Attempts were made to minimise the on-screen visibility of the zips on the tails, such as adding extra scales and crafting a ridge of material around the length of the zip. The tail fin itself was designed with a foot pedal to assist the actresses with swimming. This, along with the fin, adds some 60 centimetres (2 ft) to the length of the costume.

Summary
Rikki Chadwick, Emma Gilbert, and Cleo Sertori are three teenage Australian girls who find themselves stranded on the mysterious Mako Island, where they end up in a pool under a dormant volcano just as a full moon passes overhead, bathing the pool in light. The girls are rescued and brought back to shore, where they return to their normal lives, until discovering their lives have become anything but normal. The girls find out that ten seconds after coming into contact with water they transform into mermaids. After further experimentation, the girls also discover they have supernatural powers over water. The trio enlist the help of Cleo's friend Lewis McCartney to help them keep their secret.

Everyday situations, such as bathing and dealing with rainy weather, become tricky as the girls struggle with their newfound abilities, which come with many advantages and disadvantages, while also trying to keep them a secret from everyone else, including their families. They soon adapt to their new abilities and lifestyles.

Series two introduces Charlotte Watsford, a rival to Cleo,  Lewis shortly after Cleo had broken up with him. She gains mermaid powers and becomes the main antagonist of series two. She has all three of the mermaids' powers. In the end, Charlotte loses both her powers and Lewis.

Series three sees the departure of Emma, who has left to travel the world with her parents. A new character, Bella Hartley, is introduced and it is discovered that she has been a mermaid since the age of nine. Rikki and Cleo become friends with Bella, but are soon beset by a mysterious tentacle of water with a connection to Mako Island. A new boy, Will Benjamin, also arrives and becomes friends with the trio when he discovers that they are mermaids. The girls learn that Earth is in the path of a comet that could destroy the planet. Using their powers, they manage to stop the comet from colliding with Earth.